1. PreferencesDialog: When "Cancel" is selected, don't close the PreferencesDialog, just revert layout mode selection
2. For the tooltip of "Switch to Settings" added information about shortcuts
3. Shortcuts for the switching between tabs work from Settings Dialog now
4. Fixed the collapse button show after preference's change
1. Old mode, as it was always.
2. New mode, when Settings Tabs are hidden on the Plater. Use "cog" icon for the switching to the settings tabs
3. Dlg mode, when Settings Tabs are extracted to the Settings dialog. Use "cog" icon for Show or Focus the Settings Dialog
The "Collapse sidebar" toolbar appearance is set in the Preferences.