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Fix overscrolling issue

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Before there was a problem of overscrolling:
when messages longer than y axis of the terminal are fetched from the DB,
profanity scroll "jumps" to the top, skipping some messages.

It's resolved by keeping messages' starting and ending line in the
internal profanity buffer, which allows to track proper message positions
and to adjust window position accordingly.

Message size is now tracked as part of the buffer's record in `_line`
variable, which allows calculation of the total buffer size, which
might be a part of the improved solution for the "underscrolling" problem,
if we are going to limit profanity's buffer size by amount of lines as
opposed to the limitation based on the amount of message which is currently
used.

Before adding a limitation by amount of lines, careful consideration is
required, as some users don't use history and their temporary message
history can be cut to minimal limit because of 1 long received/sent message.

Underscrolling problem was fixed in a previous commit
d7e46d64fe
Short recap of the problem:
Despite user scrolling to top/bottom of history,
factual position is offset from the intended location

Another feature of this commit is a minor change which adds fetching
message stanza IDs from the DB. It allows correcting messages
fetched from history.

Fixes https://github.com/profanity-im/profanity/issues/1934
This commit is contained in:
John Hernandez
2023-12-15 11:06:36 +01:00
parent 605ee6e99a
commit 4fe2c423b1
4 changed files with 100 additions and 68 deletions
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7
src/ui/buffer.h
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@@ -52,6 +52,9 @@ typedef struct prof_buff_entry_t
// pointer because it could be a unicode symbol as well
gchar* show_char;
int pad_indent;
int y_start_pos;
int y_end_pos;
int _lines;
GDateTime* time;
int flags;
theme_item_t theme_item;
@@ -69,8 +72,8 @@ typedef struct prof_buff_t* ProfBuff;
ProfBuff buffer_create();
void buffer_free(ProfBuff buffer);
void buffer_append(ProfBuff buffer, const char* show_char, int pad_indent, GDateTime* time, int flags, theme_item_t theme_item, const char* const display_from, const char* const barejid, const char* const message, DeliveryReceipt* receipt, const char* const id);
void buffer_prepend(ProfBuff buffer, const char* show_char, int pad_indent, GDateTime* time, int flags, theme_item_t theme_item, const char* const display_from, const char* const barejid, const char* const message, DeliveryReceipt* receipt, const char* const id);
void buffer_append(ProfBuff buffer, const char* show_char, int pad_indent, GDateTime* time, int flags, theme_item_t theme_item, const char* const display_from, const char* const barejid, const char* const message, DeliveryReceipt* receipt, const char* const id, int y_start_pos, int y_end_pos);
void buffer_prepend(ProfBuff buffer, const char* show_char, int pad_indent, GDateTime* time, int flags, theme_item_t theme_item, const char* const display_from, const char* const barejid, const char* const message, DeliveryReceipt* receipt, const char* const id, int y_start_pos, int y_end_pos);
void buffer_remove_entry_by_id(ProfBuff buffer, const char* const id);
void buffer_remove_entry(ProfBuff buffer, int entry);
int buffer_size(ProfBuff buffer);