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Tab switcher doesn't work in certain case

See original GitHub issue

Description

When user opens a couple of files by drag&drop them to a running CudaText window without any other file opened, tab switcher only starts to work after at least one manual tab switch by mouse.

Steps to reproduce

Open CudaText.
If program option ui_reopen_session is set to true, close all open files. Set option ui_tab_switcher_dialog to false. Close CudaText.
Open CudaText. Now it should start with no files opened, only a tab named Untitled1 should be open.
Select a couple of files (i.e. more than 1) in OS file manager and drag&drop them to the window of the running CudaText instance.
The files will be loaded into tabs. The rightmost tab is the active one.

Expected behaviour

When pressing CTRL+TAB the active tab should be switched to the first/leftmost tab. When pressing CTRL+SHIFT+TAB the active tab should be switched to the tab left of the rightmost one.

Actual behaviour

Nothing happens, neither when pressing CTRL+TAB nor when pressing CTRL+SHIFT+TAB. The reason is that the CudaText window hasn’t got the input focus when drag&drop the files.

Desired behaviour

When drag&drop files from OS file manager to a CudaText window this window should get the input focus in order to make tab switcher start working immediatly.