e604d9f8e0
Whenever a document is changed helix maps various positions like the cursor or diagnostics through the `ChangeSet` applied to the document. Currently, this mapping handles replacements as follows: * Move position to the left for `Assoc::Before` (start of selection) * Move position to the right for `Assoc::After` (end of selection) However, when text is exactly replaced this can produce weird results where the cursor is moved when it shouldn't. For example if `foo` is selected and a separate cursor is placed on each character (`s.<ret>`) and the text is replaced (for example `rx`) then the cursors are moved to the side instead of remaining in place. This change adds a special case to the mapping code of replacements: If the deleted and inserted text have the same (char) length then the position is returned as if the replacement doesn't exist. only keep selections invariant under replacement Keeping selections unchanged if they are inside an exact replacement is intuitive. However, for diagnostics this is not desirable as helix would otherwise fail to remove diagnostics if replacing parts of the document. |
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