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	Add Pull Request merge options - Ignore white-space for conflict checking, Rebase, Squash merge (#3188)
* Pull request options migration and UI in settings * Add ignore whitespace functionality * Fix settings if pull requests are disabled * Fix migration transaction * Merge with Rebase functionality * UI changes and related functionality for pull request merging button * Implement squash functionality * Fix rebase merging * Fix pull request merge tests * Add squash and rebase tests * Fix API method to reuse default message functions * Some refactoring and small fixes * Remove more hardcoded values from tests * Remove unneeded check from API method * Fix variable name and comment typo * Fix reset commit count after PR merge
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		@@ -495,7 +495,7 @@ func ViewPullFiles(ctx *context.Context) {
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}
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// MergePullRequest response for merging pull request
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func MergePullRequest(ctx *context.Context) {
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func MergePullRequest(ctx *context.Context, form auth.MergePullRequestForm) {
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	issue := checkPullInfo(ctx)
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	if ctx.Written() {
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		return
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@@ -514,15 +514,42 @@ func MergePullRequest(ctx *context.Context) {
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		}
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		return
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	}
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	pr.Issue = issue
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	if !pr.CanAutoMerge() || pr.HasMerged {
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		ctx.Handle(404, "MergePullRequest", nil)
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		return
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	}
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	if ctx.HasError() {
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		ctx.Flash.Error(ctx.Data["ErrorMsg"].(string))
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		ctx.Redirect(ctx.Repo.RepoLink + "/pulls/" + com.ToStr(pr.Index))
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		return
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	}
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	message := strings.TrimSpace(form.MergeTitleField)
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	if len(message) == 0 {
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		if models.MergeStyle(form.Do) == models.MergeStyleMerge {
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			message = pr.GetDefaultMergeMessage()
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		}
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		if models.MergeStyle(form.Do) == models.MergeStyleSquash {
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			message = pr.GetDefaultSquashMessage()
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		}
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	}
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	form.MergeMessageField = strings.TrimSpace(form.MergeMessageField)
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	if len(form.MergeMessageField) > 0 {
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		message += "\n\n" + form.MergeMessageField
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	}
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	pr.Issue = issue
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	pr.Issue.Repo = ctx.Repo.Repository
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	if err = pr.Merge(ctx.User, ctx.Repo.GitRepo); err != nil {
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	if err = pr.Merge(ctx.User, ctx.Repo.GitRepo, models.MergeStyle(form.Do), message); err != nil {
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		if models.IsErrInvalidMergeStyle(err) {
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			ctx.Flash.Error(ctx.Tr("repo.pulls.invalid_merge_option"))
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			ctx.Redirect(ctx.Repo.RepoLink + "/pulls/" + com.ToStr(pr.Index))
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			return
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		}
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		ctx.Handle(500, "Merge", err)
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		return
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	}
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