Fix c++ code escape markup

Author: djowel

docs/modules/ROOT/pages/elements.adoc

@@ -22,7 +22,7 @@ of elements that can be used with templates and template functions. The
 `element` class, while the `ElementPtr` concept constrains the type of a
 pointer to an element.
 
-[,c++]
+[source,c++]
 ----
 namespace concepts
 {
@@ -50,7 +50,7 @@ There are a couple of type aliases that are useful when dealing
 with shared pointers:
 
 ==== Type aliases
-[,c++]
+[source,c++]
 ----
 using element_ptr = std::shared_ptr<element>;
 using element_const_ptr = std::shared_ptr<element const>;
@@ -68,7 +68,7 @@ using weak_element_const_ptr = std::weak_ptr<element const>;
 
 ==== Expressions
 
-[,c++]
+[source,c++]
 ----
 share(e)    // <1>
 get(ep)     // <2>

docs/modules/ROOT/pages/elements/button_stylers.adoc

@@ -270,7 +270,7 @@ appearance. The result is then passed to one of the button creation functions
 
 Make a default momentary button with label "My Button":
 
-[,c++]
+[source,c++]
 ----
 auto btn = momentary_button(
       button_styler{"My Button"}
@@ -279,7 +279,7 @@ auto btn = momentary_button(
 
 Make a blue momentary button with label "Lock":
 
-[,c++]
+[source,c++]
 ----
 auto btn = momentary_button(
       button_styler{"Lock"}
@@ -290,7 +290,7 @@ auto btn = momentary_button(
 Make a momentary button with label "Rounded Left" and a `left_circled` icon,
 aligned to the left, with a rounded left corner of 10 pixels:
 
-[,c++]
+[source,c++]
 ----
 auto btn = momentary_button(
       button_styler{"Rounded Left"}

docs/modules/ROOT/pages/elements/buttons.adoc

@@ -27,7 +27,7 @@ slide switches, checkboxes, and more.
 
 === Declaration
 
-[,c++]
+[source,c++]
 ----
 class basic_button;           // Base class for momentary buttons
 class basic_toggle_button;    // Base class for toggle buttons
@@ -36,7 +36,7 @@ class basic_latching_button;  // Base class for latching buttons
 
 === Concepts
 
-[,c++]
+[source,c++]
 ----
 namespace concepts
 {
@@ -174,7 +174,7 @@ The `state` argument indicates whether the button is ON (`true`) or OFF
 
 === Example
 
-[,c++]
+[source,c++]
 ----
 btn.on_click =
    [](bool state)
@@ -272,7 +272,7 @@ will receive a `button_state` when the button's state changes:
 
 === button_state
 
-[,c++]
+[source,c++]
 ----
 struct button_state
 {

docs/modules/ROOT/pages/layout/decks.adoc

@@ -45,7 +45,7 @@ a|
 
 === Example
 
-[,c++]
+[source,c++]
 ----
 deck(item1, item2, item3, item4)
 ----
@@ -73,14 +73,14 @@ Remember that the items are `element_ptr` instances.
 
 === Expression
 
-[,c++]
+[source,c++]
 ----
 deck_composite c;
 ----
 
 === Example
 
-[,c++]
+[source,c++]
 ----
 c.push_back(share(child));
 ----

docs/modules/ROOT/pages/layout/flow.adoc

@@ -37,14 +37,14 @@ Remember that the items are `element_ptr` instances.
 
 === Expression
 
-[,c++]
+[source,c++]
 ----
 flow_composite c;
 ----
 
 === Example
 
-[,c++]
+[source,c++]
 ----
 c.push_back(share(child));
 ----

docs/modules/ROOT/pages/layout/grids.adoc

@@ -75,7 +75,7 @@ a|
 
 === Example
 
-[,c++]
+[source,c++]
 ----
 static float positions[] = {0.25, 0.5, 0.75, 1.0};
 //...
@@ -120,14 +120,14 @@ Remember that the items are `element_ptr` instances.
 
 === Expression
 
-[,c++]
+[source,c++]
 ----
 hgrid_composite c{positions};
 ----
 
 === Example
 
-[,c++]
+[source,c++]
 ----
 c.push_back(share(child));
 ----
@@ -215,7 +215,7 @@ a|
 
 === Example
 
-[,c++]
+[source,c++]
 ----
 static float positions[] = {0.25, 0.5, 0.75, 1.0};
 //...
@@ -259,14 +259,14 @@ Remember that the items are `element_ptr` instances.
 
 === Expression
 
-[,c++]
+[source,c++]
 ----
 vgrid_composite c{positions};
 ----
 
 === Example:
 
-[,c++]
+[source,c++]
 ----
 c.push_back(share(child));
 ----

docs/modules/ROOT/pages/layout/layers.adoc

@@ -62,7 +62,7 @@ a|
 
 === Example
 
-[,c++]
+[source,c++]
 ----
 layer(item1, item2, item3, item4)
 ----
@@ -86,14 +86,14 @@ Remember that the items are `element_ptr` instances.
 
 === Expression
 
-[,c++]
+[source,c++]
 ----
 layer_composite c;
 ----
 
 ==== Example
 
-[,c++]
+[source,c++]
 ----
 c.push_back(share(child));
 ----

docs/modules/ROOT/pages/layout/limits.adoc

@@ -14,7 +14,7 @@ will be placed in the view depending on available window space.
 
 === Declaration
 
-[,c++]
+[source,c++]
 ----
 struct view_limits
 {
@@ -35,7 +35,7 @@ specify positions or dimensions within the graphical context.
 By default, an element has full limits, meaning there is no constraints on
 its size. It is infinitely resizable:
 
-[,c++]
+[source,c++]
 ----
 constexpr view_limits full_limits = {
    {0.0, 0.0}
@@ -53,17 +53,17 @@ y size) up to the full extent of the screen, and beyond (if possible).
 
 === Examples
 
-[,c++]
+[source,c++]
 ----
 {{100, 100}, {100, 100}}; // Fixed size
 ----
 
-[,c++]
+[source,c++]
 ----
 {{100, 100}, {100, full_extent}}; // Fixed width, flexible height
 ----
 
-[,c++]
+[source,c++]
 ----
 {{100, 100}, {100, 200}}; // Fixed width, semi-flexible height (100 to 200)
 ----

docs/modules/ROOT/pages/layout/span.adoc

@@ -9,7 +9,7 @@ The span of an element is the number of columns or rows it occupies in a grid
 Grids>>). The span of an element is determined by the element's `span` member
 function:
 
-[,c++]
+[source,c++]
 ----
 virtual unsigned span() const;
 ----

docs/modules/ROOT/pages/layout/stretch.adoc

@@ -12,14 +12,14 @@ side in an <<htile,htile>> or <<vtile,vtile>>, the element's "stretchiness"
 determines how much extra space is given to it. The element's "stretchiness"
 is determined by the element's `stretch` member function:
 
-[,c++]
+[source,c++]
 ----
 virtual view_stretch stretch() const;
 ----
 
 where `view_stretch` is a struct declared as:
 
-[,c++]
+[source,c++]
 ----
 struct view_stretch
 {

docs/modules/ROOT/pages/layout/tiles.adoc

@@ -79,7 +79,7 @@ a|
 
 === Example:
 
-[,c++]
+[source,c++]
 ----
 htile(item1, item2, item3, item4)
 ----
@@ -103,14 +103,14 @@ remember that the items are `element_ptr` instances.
 
 === Expression
 
-[,c++]
+[source,c++]
 ----
 htile_composite c;
 ----
 
 === Example
 
-[,c++]
+[source,c++]
 ----
 c.push_back(share(child));
 ----
@@ -191,7 +191,7 @@ a|
 
 === Example
 
-[,c++]
+[source,c++]
 ----
 vtile(item1, item2, item3, item4)
 ----
@@ -215,14 +215,14 @@ Just remember that the items are `element_ptr` instances.
 
 === Expression
 
-[,c++]
+[source,c++]
 ----
 vtile_composite c;
 ----
 
 === Example
 
-[,c++]
+[source,c++]
 ----
 c.push_back(share(child));
 ----