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ime: fix rendering of pre-edit cursor when positioned after the pre-edit string

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We failed to convert the byte-indices to cell indices, resulting in a
box cursor covering the entire pre-edit string.

Note that in addition to fixing the translation from byte index to
cell index, the rendered had to be updated to dirty one extra cell
from the original grid.

Without this, we left trailing cursors behind us when the user deleted
text from the pre-edit string.
This commit is contained in:
Daniel Eklöf 2021-01-25 21:57:42 +01:00
parent f9a43209f2
commit adbf036053
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GPG key ID: 5BBD4992C116573F
3 changed files with 25 additions and 9 deletions
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19
ime.c
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@ -194,6 +194,8 @@ done(void *data, struct zwp_text_input_v3 *zwp_text_input_v3,
cell_idx += width;
}
const size_t byte_len = strlen(seat->ime.preedit.pending.text);
/* Pre-edit cursor - hidden */
if (seat->ime.preedit.pending.cursor_begin == -1 ||
seat->ime.preedit.pending.cursor_end == -1)
@ -206,6 +208,15 @@ done(void *data, struct zwp_text_input_v3 *zwp_text_input_v3,
term->ime.preedit.cursor.end = -1;
}
else if (seat->ime.preedit.pending.cursor_begin == byte_len &&
seat->ime.preedit.pending.cursor_end == byte_len)
{
/* Cursor is *after* the entire pre-edit string */
term->ime.preedit.cursor.hidden = false;
term->ime.preedit.cursor.start = cell_count;
term->ime.preedit.cursor.end = cell_count;
}
else {
/*
* Translate cursor position to cell indices
@ -220,16 +231,8 @@ done(void *data, struct zwp_text_input_v3 *zwp_text_input_v3,
*
* When we find the matching *byte* index, we at the same
* time know both the unicode *and* cell index.
*
* Note that this has only been tested with
*
* cursor_begin == cursor_end == 0
*
* I haven't found an IME that requests anything else
*/
const size_t byte_len = strlen(seat->ime.preedit.pending.text);
int cell_begin = -1, cell_end = -1;
for (size_t byte_idx = 0, wc_idx = 0, cell_idx = 0;
byte_idx < byte_len &&