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af6cc66369
Fixes #741 This completely reimplements double-click-and-drag logic for selecting by word. The previous implementation was horribly broken. See #741 for all the details. The implemented logic now is: * A double-click initiates a select-by-word selection mechanism. - A double-click may start on a word or whitespace - If the initial double-click is on a word, that word is immediately selected. - If the initial double-click is on whitespace, the whitespace is not selected. * A "word" is determined by a non-boundary character meeting a boundary character. - A boundary character is `NUL` ` ` (space) `\t` `'` `"` - This list is somewhat arbitrary to make the terminal "feel" good. - Cell SGR states (fg/bg, bold, italic, etc.) have no effect on boundary determination or selection logic. * As the user drags _on the same line_: - No selection change occurs until the cursor is over a new word. Whitespace change does nothing. - When selection is over a new word, that entire word added to the selection. * When the user drags _up_ one or more lines: - If the cursor is over whitespace, all lines from the selection point up to but not including the cursor line are selected. * This selection is done in accordance to the previous rules. - If the cursor is over a word, the word becomes the beginning of the selection. - The end of the selection in all cases is the first word at or before the initial double-click point. * When the user drags _down_ one or more lines: - The same logic as _up_ but swap the "beginning" and "end" of selection terminology. * With this logic, the behavior of Ghostty has the following invariants: - Whitespace is never selected unless it is between two selected words - Selection implies at least one word is highlighted - The initial double-click point marks the beginning or end of a selection, never the middle.