+30
-3
lines changedFilter options
+30
-3
lines changed Original file line number Diff line number Diff line change
@@ -138,10 +138,18 @@ local function compute_start_range(prev_lines, curr_lines, firstline, lastline,
138 138
-- new lines(O), the new newline is inserted at the line indicated by
139 139
-- new_lastline.
140 140
if firstline == lastline then
141 +
local line_idx
141 142
local line = prev_lines[firstline - 1]
142 -
byte_idx = #line + 1
143 -
char_idx = compute_line_length(line, offset_encoding) + 1
144 -
return { line_idx = firstline - 1, byte_idx = byte_idx, char_idx = char_idx }
143 +
if line then
144 +
line_idx = firstline - 1
145 +
byte_idx = #line + 1
146 +
char_idx = compute_line_length(line, offset_encoding) + 1
147 +
else
148 +
line_idx = firstline
149 +
byte_idx = 1
150 +
char_idx = 1
151 +
end
152 +
return { line_idx = line_idx, byte_idx = byte_idx, char_idx = char_idx }
145 153
end
146 154 147 155
-- If firstline == new_lastline, the first change occurred on a line that was deleted.
@@ -259,6 +259,25 @@ describe('incremental synchronization', function()
259 259
}
260 260
test_edit({""}, {"o"}, expected_text_changes, 'utf-16', '\n')
261 261
end)
262 +
it('insert a line above the current line', function()
263 +
local expected_text_changes = {
264 +
{
265 +
range = {
266 +
['start'] = {
267 +
character = 0,
268 +
line = 0
269 +
},
270 +
['end'] = {
271 +
character = 0,
272 +
line = 0
273 +
}
274 +
},
275 +
rangeLength = 0,
276 +
text = '\n'
277 +
}
278 +
}
279 +
test_edit({""}, {"O"}, expected_text_changes, 'utf-16', '\n')
280 +
end)
262 281
end)
263 282
describe('multi line edit', function()
264 283
it('deletion and insertion', function()
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