When I select a block of text using the mouse, Vim goes into
selection mode instead of Visual mode. Why? The ‘selectmode’ option controls whether Select mode will be started when selecting a block of text using the mouse. To start Visual mode when selecting text using mouse, remove the ‘mouse’ value from the ‘selectmode’ option:
:set selectmode-=mouse
Note that by default, the ‘selectmode’ option will be set to empty, so that always visual mode is used.
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