[fixed] Show toggle state for Document Pane, Tags and Properties buttons
I'm using InfoQube IM 0.9.115d build 09/05/2020. I would like to have the buttons on the Standard toolbar (and in the View menu) set and show the toggle state of the Document Pane, Tags pane and Properties pane.
When opening an IQbase that only shows the grid the buttons are all toggled "off" i.e. no orange background.
Document pane button
- Single-click on document pane button: shows document pane, icon toggles to "on" i.e. orange background
- Second single-click moves the focus to the document pane if the focus was on the grid, icon still "on"
- Third single-click closes the document pane, icon still "on".

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