[kmail2] [Bug 352906] New: KMail 4.14.10 is unresponsive during spellchecking binary attachments

[Zbigniew Luszpinski]

https://bugs.kde.org/show_bug.cgi?id=352906

            Bug ID: 352906
           Summary: KMail 4.14.10 is unresponsive during spellchecking
                    binary attachments
           Product: kmail2
           Version: 4.14.7
          Platform: Compiled Sources
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: composer
          Assignee: kdepim-bugs at kde.org
          Reporter: zbiggy at o2.pl

I use KMail to report fraudalent spam mails (usually fake lotteries, nigerian
scams) to abuse e-mail adresses. When I paste source of such fraudalent message
which contains word/pdf attachment KMail spellchecker scans base64 encoded
binary content. Because such content is long KMail is frozen till it scans all
base64 content which takes few minutes.

Reproducible: Always

Steps to Reproduce:
1. Select any message with attachment
2. When displaying message with attachment press 'v' key to show source of
message.
3. Press Ctrl+a to select all source content and Ctrl+c to copy it.
4. Compose a new message and paste (Ctrl+v) all content
KMail will freeze and will remain frozen till all content will be spell
checked. This will happen several times during document editing when spell
checking reoccurs. 

Actual Results:  
KMail freezes until all base64 encoded attachment codes are spell checked.

Expected Results:  
KMail should skip spell checking base64 encoded content.
Base64 content is ascii encoded text stream without spaces. KMail can detect if
word is longer than 20 characters then skip spellchecking it.

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