Fix behaviour of wxTextCtrl without wxTE_PROCESS_TAB in wxGTK
TAB should be used for navigation by default and only should be inserted into the control as a literal character if wxTE_PROCESS_TAB is specified for consistency with wxMSW and because this behaviour is much more useful by default. Fix this by calling gtk_text_view_set_accepts_tab() as appropriate for multiline text controls. For single line ones, the behaviour is unchanged but it's more reasonable as TAB is always handled as if wxTE_PROCESS_TAB were not specified and it doesn't seem really useful to try to support wxTE_PROCESS_TAB for them anyhow, so just document this limitation. Also remove the outdated/misleading documentation of this style, notably don't say that it is required to get char events for TAB presses as these events are generated both with and without this style in both wxGTK and wxMSW. Closes https://github.com/wxWidgets/wxWidgets/pull/704
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@@ -945,10 +945,12 @@ public:
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(otherwise pressing Enter key is either processed internally by the
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control or used to activate the default button of the dialog, if any).
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@style{wxTE_PROCESS_TAB}
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The control will receive @c wxEVT_CHAR events for TAB pressed -
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normally, TAB is used for passing to the next control in a dialog
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instead. For the control created with this style, you can still use
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Ctrl-Enter to pass to the next control from the keyboard.
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Normally, TAB key is used for keyboard navigation and pressing it in
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a control switches focus to the next one. With this style, this
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won't happen and if the TAB is not otherwise processed (e.g. by @c
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wxEVT_CHAR event handler), a literal TAB character is inserted into
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the control. Notice that this style has no effect for single-line
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text controls when using wxGTK.
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@style{wxTE_MULTILINE}
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The text control allows multiple lines. If this style is not
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specified, line break characters should not be used in the controls
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