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The FileSystem Label dialog only has a single line of just 2 widgets; a text label and entry box widget. There is no need to use a multi-line capable table to hold this. Switch to a simpler horizontal box widget. Note that this change is not related to porting to Gtk 3 and stopping using deprecated APIs because both HBox [1] and Table [2] are deprecated in Gtk 3.2 and Gtk 3.4 and replaced by Box with horizontal orientation and Grid respectively. [1] NEWS file from gtkmm 3.2, actually first released in gtkmm 3.1.6 (unstable): https://git.gnome.org/browse/gtkmm/tree/NEWS?h=3.2.0#n91 "Gtk: * All H* or V* specialized classes have been deprecated, to match the deprecations in the GTK+ C API. You should now set the orientation instead. This includes HBox, VBox, HButtonBox, VButtonBox, HPaned, VPaned, HScale, VScale, HSeparator, VSeparator, HScrollbar and VScrollbar." [2] NEWS file from gtkmm 3.4, actually first released in gtkmm 3.3.2 (unstable): https://git.gnome.org/browse/gtkmm/tree/NEWS?h=3.4.0#n162 "* Deprecate Gtk::Table in favour of Gtk::Grid."
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