port an old fix to source editor
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@ -111,7 +111,7 @@ function edit.check_locs(State)
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-- if State is inconsistent (i.e. file changed by some other program),
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-- throw away all cursor state entirely
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if edit.invalid1(State, State.screen_top1)
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or edit.invalid1(State, State.cursor1)
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or edit.invalid_cursor1(State)
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or not edit.cursor_on_text(State)
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or not Text.le1(State.screen_top1, State.cursor1) then
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State.screen_top1 = {line=1, pos=1}
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@ -127,6 +127,16 @@ function edit.invalid1(State, loc1)
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return loc1.pos > #State.lines[loc1.line].data
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end
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-- cursor loc in particular differs from other locs in one way:
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-- pos might occur just after end of line
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function edit.invalid_cursor1(State)
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local cursor1 = State.cursor1
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if cursor1.line > #State.lines then return true end
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local l = State.lines[cursor1.line]
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if l.mode ~= 'text' then return false end -- pos is irrelevant to validity for a drawing line
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return cursor1.pos > #State.lines[cursor1.line].data + 1
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end
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function edit.cursor_on_text(State)
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return State.cursor1.line <= #State.lines
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and State.lines[State.cursor1.line].mode == 'text'
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